Collapsible core bar



1929; J. E. PERRY 'COLLAPSIBLE CORE BAR Original Filed July 2, 1926 3 Sheets-Sheet [W I M ORNEY May 7, 1929. J. E. PERRY COLLAPSIBLE GORE BAR original Filed July 2, 1926 3 Sheets-Sheet 2 ATTORNEY Z2 INVENTOR Okla Elerry 9 Z J zamw w Z 2 Patented May 7, 1929.

UNITED STATES JOHN EDMUND runny, or SHARON, PENNSYLVAMA.

COLLAPSIBLE cons BAR.

Original application filed July 2, 1926, Serial at. 120,280. Divided and but application filed February 7', 1927. Serial No. 165,373.

This invention relates broadly to metallurgy and more especially to a core bar for use in the manufacture of ingot molds and the like. 1

This is a division of my application Serial Number 120,280. filed JulyQ, 1926, and relates to a core bar structure which may be used in connection with the ingot'mold disclosed and claimed in the said. prior applications.

The core bar comprising the present invention may be used without a sand facing, D1 where desired, sand may be applied thereto in the usual way and when so used this structure comprises a core bar for carrying sand. In the preferred form of the core according to the present invention, the core member comprises a plurality of metal side plates constructed in such manner as to collapse by inward movement toward the axis of the core and thereby occupy a lesser crosssectional space when collapsed than when full opened, so that the collapsed core member may easily Withdrawn after the mold is cast. Where the core is used without sand, there may be a slight tendency to form small ribs on the ingot mold where the side faces meet, but since these ribs are straight longitudinal lines, they do not interfere with strip= pingan ingot mold from this core, and nei ther do they interfere with the fabrication of an ingot cast in a mold that has been made on this core. The movable side plates of the core are controlled in. such manner that certain of the plates initially move inwardly be yond the thickness of others of the plates, while said other plates are held substantially stationary. This permits 7 moving plates to pass the edges of the initially substantially stationary plates to provide clearance for the inward movement so that all the plates may finally move inwardly to withdraw the side plates from the frozen side walls of an ingot mold. where the core is used without sand, or to permit the sand to pull away from the core bar where the memher is sand faced in order to facilitate stripping the cast ingot molds from the sanded core bar.

The form of construction shown in the drawings is the preferred form of the invention and. comprises a compliance with the patent statutes. It is to be understood. however. that the invention may be embodied in cen r'uct ens Othe han those p ci ica y the edges of the disclosed and therefore, the disclosure is to be considered as illustrative and not in the limiting sense. I

1 is a vertical elevation cal-ten upon line l al of Fig. 3. 7

line 2-2 of 8.

Fig. 3 is a horizontal section comprising a plan view taken on line 3 3 of Fig. 1.

Fig. 4, is also a horizontal section 'in which the side plates are shown in the position which they occupied when the core is collapsed.

Referring now more particularly to F i g. 1, the core is of the type wherein the side plates are controlled by a control barin such manner that the control bar may be raised or lowcred and thereby cause an inward or outward movement to the side plates. depending upon which way the core control'bar is moved. In the preferred form illustrated, the core memher is provided with a bottom 2 which may be of any suitable size or shape and which carries a vertical column comprising a tube 7. Acontrol bar 8 is slidably mounted within the tube and carries pairs of control plates 9 and 10, which for a four-side plate bar are arranged substantially at right angles to each other. These control plates 9 and 10 extend through slotted openingsll and12in the tube 7. The control plates 9 are provided with full cam slots 14 that enclose rivets or bolts 15 which extend between the arms 16 that are integral with the side plates 17. These cam s'lots 1 1 are provided with open upper ends to facilitate assembly of parts by arranging the side; plates 17 "insuc'h manner as to enable the rivets 15 to enter the cam slots. Preferably, the side plates 17 are recessed as lSto form clearance spaces for the ends of the control plates 9.

If theparts are in the position shown in Fig. 1 and the control bar 8 is forced. downwardly, the action of the cam slots 141 upon the rivets or bolts 15 carried by the arm 16 will cause the side plates 17 to be drawn inwardly toward the axis of the control bar 8. 1

Referring now to Fig. 2, it will be noted that the control plates 10 are provided with cam slots having a double action and comprising a vertical portion 19 and an upper inclined portion 20. These slots are also open at the upper ends for assembly purposes, the same as slots 141. These slots likewise c0- Fig. 2 is also a vertical elevation taken on operate with rivets or bolts 21 extending between the arms 22 carried by the side plates 24:, and the side plates 24 are also preferably recessed as at 25 to form clearance spaces for the ends of the control plates 10. If the parts are in the position shown in Fig. 2 when the control bar is forced downwardly, the side plates 24 will remain substantially stationary during the downward movement of the control bar 8 equal to the height of the vertical portions 19 of the slots, but as soon as the downward movement of the control bar causes the inclined portion 20 of the slots to engage the rivets or bolts 21, the side plates 24 will move inwardly. This inward move ment does not begin until after the side plates 17 have been moved in sutliciently so that their edges clear the edges of the side plates 52ml. \Vhen the control bar 8 has been forced down to its limit of movement, the plates will be in the inner position and the core bar will be collapsed. The expanded periphery of the core is indicated in Fig. at by dotted line 26 and therefore it will be noted that when the core bar is collapsed, the side plates are considerably within this boundary and conse quently, the core may be easily stripped from a. solidified ingot mold whether the core be used in direct contact with the ingot mold which has been cast around it, or whether the core bar be covered by a sand facing. The bottom 27 of both sets of side plates 17 and 24 is preferably machined to form a metal to metal joint with the base 2 when the core is in position in the set-up; although where desired, a sand floor may be provided on the base plate and when this is used, the bottoms of the side plates preferably contact with the sand floor.

here the side plates 17 and 24 are .used without sand covering, they may be made of any suitable metal that will stand the temperature of molten iron and preferably are formed of castiron. The outer faces of these side plates are preferably smooth so that when the core is expanded, a very smooth continuous periphery of the shape desired provided in order to form a smooth matrix surface upon the ingot mold being cast. Preferably. the side plates are of sutlicient thickness and weight to e lfectually chill hot molten "ast iron brought against these plates, that is. where the plates are used without sand facing. It will be observed in Figs. 3 and -l, which show cross notions of the side plates, that the side plates are thickened at the corners. It is obvious that this thicker metal at the corners has a greater heat absorbing effect on the molten iron which comes in contact with these plates than does the thinner metal adjacent the edges of the plates, which is the middle of the core bar when expanded. This heavy or thick metal at the corners of the plates is advantageous in that in an ingot mold having a rectangular cross section, as is determined by the form shown in Figs. 3 and 41, there is usually greater heat to be absorbed at the corners than at the sides of the core bar. The additional heat absorbing capacity at the corners of the core bar therefore makes a more uniform depth to the chill on the matrix walls than if the metal in the side plates of the core bar was of uniform thickness throughout. If a sand facing is used over the plates, then they may be of lighter weight, but in any case, they are of sufficient weight to withstand normal stresses brought against these parts during the molding and casting operations. The top of the core bar i'nen'iber, preferably, though not necessarily, is covered by a top plate 28, and when so covered, the vertical standard tube 7 and also the control bar 8 extend through this top plate 28, and the standard 7 and con trol bar 8 are slotted to 'eceive a key 29, which will retain the control bar raised and therefore hold the core in expanded relation. lVhen it is desired to collapse the core, the key 29 is driven out and the control bar 8 is forced downwardly. This core bar structure is simple in construction, positive in action and rigid when expanded.

The joints between the side plates 17 and the cooperating pair of side plates 2% may be inclined so that if the planes of the joint faces on the plate 24: be extended inwardly these planes would meet further away from the axis of the control bar than the distance between the axis of the control bar and the plane determined by the outer edges of these faces. In other words, the jointbetween the side plates 17 and 2% is inclined to form the side plates 17 into wedges, so that as the plates 17 move outwardly to their final position, the surfaces on the edges of these plates act as wedges to force outwardly slightly the side plates 24. In this Construction, it will be observed that if the slots 19 are slightly wider than the rivets or bolts 21. the final outward movement of the plates 17 will act as a wedge to cause a slight outward movement to the plates 2% when the plates 17 are moving to their final outer position, and the reverse of this action takes place when the side plate 17 starts to move inward. This construction permits a release of inwardly directed radial pressure on the core bar as soon as the control bar 8 is raised. This action may be desirable where the core is used in direct contact with the molten iron because as molten iron freezes to form the ingot mold, it tends to contract and by removing the key 29 the contracting forces may be relieved as the freezing and cooling of the mold progresses. Furthermore, this wedge side plate arrangement prevents the contraeting forces from jamming the side plates so tightly together that difficulty is encoun tered in attempting to collapse the bar after the mold has cooled.

Ill)

Having thus described my invention, what I claim is:

1. As an article of manufacture, a collapsible core for use in casting ingot molds, said core comprising in combination movable side plates, each of said plates comprising a solid corner and a portion of the sides adjacent said corner, a control bar, a vertical column for supporting the control bar, and means connecting said control bar and said side plates to collapse said core to strip the same from a solidified ingot mold.

2. As an article of manufacture, a collapsible core for use in casting ingot molds, said core comprising in combination movable side plates, a control bar, and means connecting said control bar and said side plates to collapse said core to strip the same from a solidified ingot mold, the line of contact between said side plates being adjacent the mid-portion of the side of the core.

3. A core for casting ingot molds comprising in combination a plurality of side plates, a control bar, and means operated by said control bar to move certain of said plates inwardly while maintaining certain other of said plates stationary.

4E. An artcile of manufacture comprising a core for use in casting ingot molds and having vertically extending side plates with the juncture between the side plates being remote from the corners thereof, a control member, means operatively connecting said member and said plates to move said plates radially to collapse said core.

5. An article of manufacture comprising a core for manufacturing ingot molds having in combination a plurality of vertically extending pairs of side plates, a control member operatively connected with said side plates to cause a. radial inward movement of a certain pair of side plates while another of said pairs are held stationary and to move inwardly said other pair of side plates after the first mentioned pair has cleared the edges of the second mentioned pair of side plates.

6. A collapsible core for manufacturing ingot molds and the like comprising in com bination a plurality of vertical side plates, a base plate, a tubular standard mounted on said base pl ate, a control bar vertically movable in said standard, slotted control plates carried by said control bar and operatively connected with said side plates in. such manner as to cause a substantially continuous inward movement to certain of said side plates when said. control bar is operated and an intermittent movement to others of said side plates during the operation of said control bar.

7. An article of manufacture comprising a core bar for use in casting ingot molds and having vertically extending side plates, a control member, means operatively connecting said member and said plates to move said plates radially to collapse said core, and inclined faces on certain of said plates to permit other of said plates to act as wedge members which at the initial movement of said control member release the pressures tending to collapse said core.

8. A core bar for use in manufacture of ingot molds comprising a standard provided with slotsinthe side wall thereof, a control bar vertically slideable within said standard, control plates carried by said control bar, side plates forming the sidewalls of said core bar, said control plates being provided with cam slots, and means operatively connecting said side plates with said cam slots to enable the movenicntof said control bar to control the lateral movementof said side plates,

9. A core bar for use in casting ingot molds con'iprising a base member, a standard extending vertically from said base member, a control bar vertically movable within said standard, said standard being provided with guiding slots, control plates carried by said control bar and extending through said slots, certain of said control plates being provided with outwardly and downwardly inclined cam slots, other of said control plates being provided with outwardly downwardly and vertically arranged cam slots, means connecting said side plates with said cam slots to permit the movement of said control bar to move said side plates in a radial direction relative to the axis of the standard.

10. A core bar for use in casting ingotmolds comprising a central standard, a plurality of side plates arranged around said standard, operating means to cause radial movements to said side plates, said operating means being constructed to move a side plate inwardly sutlicient to clear the edges of adjacent side plates While maintaining said adjacent side plates substantially stationary.

11. A core bar for use in manufacture of ingot molds comprising a plurality of side plates arranged in pairs, and operating means for said side plates constructed to move certain pairs of said side plates inwardly toward the axis of said core bar to an extent sufficient to cause the outer surfaces of said pairs to pass within and overlap the inner surfaces of adjacent pairs of side plates.

12. A core bar for manufacture of ingot molds comprising a plurality of side plates provided with inwardly extending arms adapted to carry cam contacting members, a control bar mounted substantially on the axis of said core bar, a plurality of control plates carried by said core bar, said control plates being provided with open ended cam slots to enable the members on the side plates to be assembled with and interlocked with the control plates.

13. A core bar for use in the manufacture of ingot molds comprising side plate members assembled to form a substantially rectangular cross sectional structure, the juncture between said side plate members being at the mid portion or" the sides whereby each member comprises a corner of the assembly, and with the metal at the corners thicker than at the mid portions of the assembly.

14. An article of manufacture comprising a core bar for the manufacture of ingot molds, said core bar having cast iron side plates constructed to form a substantially rectangular cross section core and these said side plates being thicker at the corners of said cross scotion than at the mid portions thereof.

15. An article of manufacture comprising a collapsible core bar for use in the manufacture of ingot molds, said core bar comprising a plurality of longitudinal sections formed of chill plates, said sections being constructed to comprise a core bar having a substantially rectangular cross section with the uncture between said sections being intermediate the corners of the rectangular cross section and with said sections having the metal thicker at the corners than adjacent the juncture of the sections.

16. A core bar for use in the manufacture of ingot molds comprising a plurality of sections extending lengthwise of said core bar, each of said sections comprising. a corner of an assembly which is substantially rectangular in cross section, and means to .move the said sections inwardly toward the axis of said core bar on lines comprising diagonals of said rectangular cross section.

JOHN EDMUND PERRY, 

